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Built 2026-10-15 (15 October 2026)

Williamson Weather Records (USC00469610)

Record envelope, standing records and threshold days for Williamson (USC00469610), West Virginia, United States, with 76 years of record.

Key Facts for Williamson

  • Williamson (USC00469610) is a weather station in West Virginia, United States at 37.68 latitude and -82.29 longitude, 210 m (688 ft) above sea level.
  • The station reports from 1951 to 2026, 76 years of record.
  • 1,464 records set at Williamson still stand.
  • Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
  • Williamson set a daily record precipitation of 41.9 mm (1.6 in) on 11 October 2026 (provisional).

Provisional Records

Records set in the last 60 days are provisional until they clear the revision window.

About the Station

  • Location: West Virginia, United States, 37.68 latitude, -82.29 longitude.
  • Elevation: 210 m (688 ft).
  • Period of record: 1951 to 2026, 76 years.
  • Eligible elements: prcp, snow, snwd.

Daily Record Envelope and 2026

40 days at or beyond a record
Daily record high and record low at Williamson, with 2026 drawn through them The band shows the record high and record low for each calendar day at Williamson. The lines show the 2026 daily maximum and minimum. 40 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. -40-2002040 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Williamson. The lines show the 2026 daily maximum and minimum. 40 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Williamson, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan26.7 C (80.1 F)-26.7 C (-16.1 F)19.4 C (66.9 F)-15.0 C (5.0 F)
Feb29.4 C (84.9 F)-25.0 C (-13.0 F)22.8 C (73.0 F)-14.4 C (6.1 F)
Mar33.9 C (93.0 F)-14.4 C (6.1 F)33.9 C (93.0 F)-5.6 C (21.9 F)
Apr35.0 C (95.0 F)-3.9 C (25.0 F)33.3 C (91.9 F)0.0 C (32.0 F)
May36.7 C (98.1 F)1.1 C (34.0 F)36.1 C (97.0 F)2.2 C (36.0 F)
Jun40.0 C (104.0 F)7.8 C (46.0 F)35.0 C (95.0 F)11.1 C (52.0 F)
Jul40.0 C (104.0 F)7.2 C (45.0 F)37.2 C (99.0 F)16.7 C (62.1 F)
Aug39.4 C (102.9 F)4.4 C (39.9 F)36.1 C (97.0 F)14.4 C (57.9 F)
Sep37.2 C (99.0 F)4.4 C (39.9 F)38.3 C (100.9 F)10.0 C (50.0 F)
Oct33.9 C (93.0 F)-2.8 C (27.0 F)33.9 C (93.0 F)8.9 C (48.0 F)
Nov31.1 C (88.0 F)-10.0 C (14.0 F)n/an/a
Dec26.7 C (80.1 F)-17.2 C (1.0 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Williamson by the year they were set 1,464 records at Williamson still stand. 2002 holds the most, with 92. 02550751001993: 291994: 361995: 651996: 771997: 571998: 282001: 142002: 922003: 332004: 482005: 382006: 652007: 782008: 662009: 432010: 632011: 382012: 722013: 372014: 542015: 522016: 292017: 352020: 32021: 422022: 482023: 552024: 542025: 702026: 431993199620012004200720102013201620212024
1,464 records at Williamson still stand. 2002 holds the most, with 92.
Standing records at Williamson by the year they were set
Year setStanding records
199329
199436
199565
199677
199757
199828
200114
200292
200333
200448
200538
200665
200778
200866
200943
201063
201138
201272
201337
201454
201552
201629
201735
20203
202142
202248
202355
202454
202570
202643

All-Time Record Progression

6 new records
When Williamson set new all-time records 6 all-time records were set at Williamson between 16 June 1989 and 19 December 2009. Each dot is a new record. Record daily precipitationRecord snow depthRecord daily snowfall16 June 1989: Record daily precipitation 96.5 mm (3.8 in)3 December 1991: Record daily precipitation 100.3 mm (3.9 in)15 March 1993: Record snow depth 45.7 cm (18.0 in)31 May 2004: Record daily precipitation 108.0 mm (4.3 in)19 December 2009: Record daily snowfall 54.6 cm (21.5 in)19 December 2009: Record snow depth 53.3 cm (21.0 in)19901995200020052010
6 all-time records were set at Williamson between 16 June 1989 and 19 December 2009. Each dot is a new record.
When Williamson set new all-time records
DateKindDetail
1989-06-16Record daily precipitationRecord daily precipitation 96.5 mm (3.8 in)
1991-12-03Record daily precipitationRecord daily precipitation 100.3 mm (3.9 in)
1993-03-15Record snow depthRecord snow depth 45.7 cm (18.0 in)
2004-05-31Record daily precipitationRecord daily precipitation 108.0 mm (4.3 in)
2009-12-19Record daily snowfallRecord daily snowfall 54.6 cm (21.5 in)
2009-12-19Record snow depthRecord snow depth 53.3 cm (21.0 in)

Wettest Day of Each Month

May: 108.0 mm (4.3 in)
Record daily precipitation for each month at Williamson The wettest day on record for each calendar month at Williamson. The most was 108.0 mm (4.3 in) on 31 May 2004. 050100150 Jan: 59.2 mm (2.3 in), 11 January 1974 Jan Feb: 82.6 mm (3.3 in), 17 February 2023 Feb Mar: 85.9 mm (3.4 in), 12 March 1963 Mar Apr: 78.0 mm (3.1 in), 15 April 2007 Apr May: 108.0 mm (4.3 in), 31 May 2004 May Jun: 96.5 mm (3.8 in), 16 June 1989 Jun Jul: 79.2 mm (3.1 in), 13 July 1966 Jul Aug: 95.3 mm (3.8 in), 19 August 2005 Aug Sep: 58.7 mm (2.3 in), 18 September 2004 Sep Oct: 78.7 mm (3.1 in), 17 October 1989 Oct Nov: 58.4 mm (2.3 in), 10 November 1962 Nov Dec: 100.3 mm (3.9 in), 3 December 1991 Dec
The wettest day on record for each calendar month at Williamson. The most was 108.0 mm (4.3 in) on 31 May 2004.
Record daily precipitation for each month at Williamson
MonthRecord daily precipitation (mm)Date
Jan59.2 mm (2.3 in)11 January 1974
Feb82.6 mm (3.3 in)17 February 2023
Mar85.9 mm (3.4 in)12 March 1963
Apr78.0 mm (3.1 in)15 April 2007
May108.0 mm (4.3 in)31 May 2004
Jun96.5 mm (3.8 in)16 June 1989
Jul79.2 mm (3.1 in)13 July 1966
Aug95.3 mm (3.8 in)19 August 2005
Sep58.7 mm (2.3 in)18 September 2004
Oct78.7 mm (3.1 in)17 October 1989
Nov58.4 mm (2.3 in)10 November 1962
Dec100.3 mm (3.9 in)3 December 1991

Period of Record Coverage

1993 to 2026
Days with data per year at Williamson 30 years of record at Williamson, 1993 to 2026. 14 years have data for under 90 percent of days and are left out of rankings: 1993, 1998, 2001, 2002, 2003, 2007, 2012, 2013 and others. 1993: 153 of 365 days1994: 356 of 365 days1995: 365 of 365 days1996: 360 of 366 days1997: 364 of 365 days1998: 172 of 365 days2001: 81 of 365 days2002: 324 of 365 days2003: 291 of 365 days2004: 360 of 366 days2005: 362 of 365 days2006: 360 of 365 days2007: 328 of 365 days2008: 363 of 366 days2009: 350 of 365 days2010: 352 of 365 days2011: 343 of 365 days2012: 323 of 366 days2013: 325 of 365 days2014: 298 of 365 days2015: 256 of 365 days2016: 216 of 366 days2017: 177 of 365 days2020: 38 of 366 days2021: 361 of 365 days2022: 362 of 365 days2023: 364 of 365 days2024: 366 of 366 days2025: 350 of 365 days2026: 270 of 365 days199520052010201520202025
30 years of record at Williamson, 1993 to 2026. 14 years have data for under 90 percent of days and are left out of rankings: 1993, 1998, 2001, 2002, 2003, 2007, 2012, 2013 and others.
Days with data per year at Williamson
YearDays with dataShare of yearComplete
199315342%No
199435698%Yes
1995365100%Yes
199636098%Yes
1997364100%Yes
199817247%No
20018122%No
200232489%No
200329180%No
200436098%Yes
200536299%Yes
200636099%Yes
200732890%No
200836399%Yes
200935096%Yes
201035296%Yes
201134394%Yes
201232388%No
201332589%No
201429882%No
201525670%No
201621659%No
201717748%No
20203810%No
202136199%Yes
202236299%Yes
2023364100%Yes
2024366100%Yes
202535096%Yes
202627074%No

Latest Records

20
Latest records at Williamson
DateStationRecordValueBeat old record byOld record stoodSignificance
11 October 2026Williamson, USdaily rain (Provisional)41.9 mm (1.6 in)0.2 mm (0.01 in)44 years20 of 100 (Routine)
28 June 2026Williamson, USdaily rain23.4 mm (0.9 in)2.8 mm (0.11 in)17 years14 of 100 (Routine)
19 June 2026Williamson, USdaily rain43.9 mm (1.7 in)8.3 mm (0.33 in)32 years23 of 100 (Routine)
25 May 2026Williamson, USdaily rain48.5 mm (1.9 in)2.8 mm (0.11 in)8 years11 of 100 (Routine)
18 March 2026Williamson, USdaily snowfall0.5 cm (0.2 in)0.5 cm (0.2 in)71 years20 of 100 (Routine)
17 March 2026Williamson, USdaily snowfall8.1 cm (3.2 in)5.6 cm (2.2 in)48 years32 of 100 (Routine)
24 February 2026Williamson, USdaily snowfall2.3 cm (0.9 in)2.3 cm (0.9 in)74 years20 of 100 (Routine)
23 February 2026Williamson, USdaily snowfall4.1 cm (1.6 in)2.8 cm (1.1 in)62 years20 of 100 (Routine)
20 February 2026Williamson, USdaily rain37.3 mm (1.5 in)17.0 mm (0.7 in)68 years44 of 100 (Notable)
30 December 2025Williamson, USdaily snowfall0.5 cm (0.2 in)0.5 cm (0.2 in)74 years20 of 100 (Routine)
12 December 2025Williamson, USdaily snow depth (Tie)7.6 cm (3.0 in)tie63 years6 of 100 (Routine)
11 December 2025Williamson, USdaily snowfall (Tie)2.5 cm (1.0 in)tie32 years4 of 100 (Routine)
5 December 2025Williamson, USdaily snow depth5.1 cm (2.0 in)2.6 cm (1.0 in)63 years20 of 100 (Routine)
5 December 2025Williamson, USdaily snowfall4.8 cm (1.9 in)2.3 cm (0.9 in)16 years14 of 100 (Routine)
11 November 2025Williamson, USdaily snowfall2.0 cm (0.8 in)2.0 cm (0.8 in)74 years20 of 100 (Routine)
8 October 2025Williamson, USdaily rain25.9 mm (1.0 in)2.8 mm (0.11 in)70 years30 of 100 (Routine)
24 August 2025Williamson, USdaily rain29.7 mm (1.2 in)8.9 mm (0.35 in)55 years30 of 100 (Routine)
5 April 2025Williamson, USdaily rain28.4 mm (1.1 in)1.7 mm (0.07 in)14 years12 of 100 (Routine)
16 February 2025Williamson, USdaily rain73.9 mm (2.9 in)34.5 mm (1.4 in)9 years46 of 100 (Notable)
12 February 2025Williamson, USdaily rain25.7 mm (1.0 in)5.9 mm (0.23 in)50 years28 of 100 (Routine)

Climate Trend

16 complete years, 1994 to 2025
Annual mean temperature at Williamson as warming stripes, 1994 to 2025 One stripe for each of 16 complete years at Williamson, 1994 to 2025. Blue stripes are years cooler than the station's own mean of 14.2 C (57.5 F); red stripes are warmer. The coolest year was 1996, at 13.2 C (55.8 F), and the warmest was 2024, at 15.5 C (60.0 F). The strongest colour marks a difference of 1.4 C (2.5 F). 1994: 13.9 C, -0.3 C from the station mean1996: 13.2 C, -1.0 C from the station mean1997: 13.4 C, -0.8 C from the station mean2004: 14.2 C, 0.0 C from the station mean2005: 14.1 C, 0.0 C from the station mean2006: 14.1 C, -0.1 C from the station mean2008: 13.7 C, -0.5 C from the station mean2010: 14.0 C, -0.2 C from the station mean2011: 14.8 C, +0.6 C from the station mean2013: 13.8 C, -0.4 C from the station mean2014: 13.3 C, -0.9 C from the station mean2021: 14.6 C, +0.4 C from the station mean2022: 14.4 C, +0.2 C from the station mean2023: 15.1 C, +0.9 C from the station mean2024: 15.5 C, +1.4 C from the station mean2025: 14.7 C, +0.5 C from the station mean1994200020052010201520202025
One stripe for each of 16 complete years at Williamson, 1994 to 2025. Blue stripes are years cooler than the station's own mean of 14.2 C (57.5 F); red stripes are warmer. The coolest year was 1996, at 13.2 C (55.8 F), and the warmest was 2024, at 15.5 C (60.0 F). The strongest colour marks a difference of 1.4 C (2.5 F).
Annual mean temperature at Williamson as warming stripes, 1994 to 2025
YearAnnual mean temperatureDifference from the station mean
199413.9 C-0.28 C
199613.2 C-0.98 C
199713.4 C-0.76 C
200414.2 C+0.04 C
200514.1 C-0.04 C
200614.1 C-0.07 C
200813.7 C-0.46 C
201014.0 C-0.17 C
201114.8 C+0.60 C
201313.8 C-0.38 C
201413.3 C-0.90 C
202114.6 C+0.41 C
202214.4 C+0.20 C
202315.1 C+0.94 C
202415.5 C+1.36 C
202514.7 C+0.53 C

This station does not have enough complete years (30 are needed) to fit a temperature trend.

A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.

Extremes by Year

1951 to 2026
Yearly extremes at Williamson: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)40.0 C (104.0 F)199436.1 C (97.0 F)30
Coldest night (TNn)-26.7 C (-16.1 F)1994-13.3 C (8.0 F)30
Wettest day (Rx1day)108.0 mm (4.3 in)200449.8 mm (2.0 in)72
Wettest five days (Rx5day)180.3 mm (7.1 in)198990.4 mm (3.6 in)72
Longest dry spell (CDD)28 days196314 days72

Hottest day (TXx)

Hottest day (TXx) at Williamson by year The hottest day of the year at Williamson, 1951 to 2026. The record is 40.0 C (104.0 F) in 1994, marked on the chart; the median year is 36.1 C (97.0 F). 20253035401960198020002020Record: 40.0 C (104.0 F) in 1994
The hottest day of the year at Williamson, 1951 to 2026. The record is 40.0 C (104.0 F) in 1994, marked on the chart; the median year is 36.1 C (97.0 F).
Hottest day (TXx) at Williamson by year
YearHottest day (TXx)
1951n/a
1952n/a
1953n/a
1954n/a
1955n/a
1956n/a
1957n/a
1958n/a
1959n/a
1960n/a
1961n/a
1962n/a
1963n/a
1964n/a
1965n/a
1966n/a
1967n/a
1968n/a
1969n/a
1970n/a
1971n/a
1972n/a
1973n/a
1974n/a
1975n/a
1976n/a
1977n/a
1978n/a
1979n/a
1980n/a
1981n/a
1982n/a
1983n/a
1984n/a
1985n/a
1986n/a
1987n/a
1988n/a
1989n/a
1990n/a
1991n/a
1992n/a
199335.6 C (96.1 F)
199440.0 C (104.0 F)
199539.4 C (102.9 F)
199636.7 C (98.1 F)
199736.1 C (97.0 F)
199835.0 C (95.0 F)
200129.4 C (84.9 F)
200236.1 C (97.0 F)
200333.9 C (93.0 F)
200433.9 C (93.0 F)
200536.7 C (98.1 F)
200636.7 C (98.1 F)
200739.4 C (102.9 F)
200835.6 C (96.1 F)
200934.4 C (93.9 F)
201035.6 C (96.1 F)
201137.2 C (99.0 F)
201240.0 C (104.0 F)
201334.4 C (93.9 F)
201433.9 C (93.0 F)
201534.4 C (93.9 F)
201635.6 C (96.1 F)
201735.6 C (96.1 F)
202023.3 C (73.9 F)
202136.7 C (98.1 F)
202237.8 C (100.0 F)
202337.2 C (99.0 F)
202438.3 C (100.9 F)
202537.2 C (99.0 F)
202638.3 C (100.9 F)

Coldest night (TNn)

Coldest night (TNn) at Williamson by year The coldest night of the year at Williamson, 1951 to 2026. The record is -26.7 C (-16.1 F) in 1994, marked on the chart; the median year is -13.3 C (8.0 F). -30-25-20-15-10-51960198020002020Record: -26.7 C (-16.1 F) in 1994
The coldest night of the year at Williamson, 1951 to 2026. The record is -26.7 C (-16.1 F) in 1994, marked on the chart; the median year is -13.3 C (8.0 F).
Coldest night (TNn) at Williamson by year
YearColdest night (TNn)
1951n/a
1952n/a
1953n/a
1954n/a
1955n/a
1956n/a
1957n/a
1958n/a
1959n/a
1960n/a
1961n/a
1962n/a
1963n/a
1964n/a
1965n/a
1966n/a
1967n/a
1968n/a
1969n/a
1970n/a
1971n/a
1972n/a
1973n/a
1974n/a
1975n/a
1976n/a
1977n/a
1978n/a
1979n/a
1980n/a
1981n/a
1982n/a
1983n/a
1984n/a
1985n/a
1986n/a
1987n/a
1988n/a
1989n/a
1990n/a
1991n/a
1992n/a
1993-10.0 C (14.0 F)
1994-26.7 C (-16.1 F)
1995-17.2 C (1.0 F)
1996-23.3 C (-9.9 F)
1997-14.4 C (6.1 F)
1998-10.6 C (12.9 F)
2001-9.4 C (15.1 F)
2002-11.1 C (12.0 F)
2003-13.9 C (7.0 F)
2004-15.0 C (5.0 F)
2005-15.0 C (5.0 F)
2006-11.7 C (10.9 F)
2007-15.6 C (3.9 F)
2008-12.8 C (9.0 F)
2009-16.7 C (1.9 F)
2010-12.8 C (9.0 F)
2011-11.7 C (10.9 F)
2012-8.9 C (16.0 F)
2013-10.6 C (12.9 F)
2014-18.9 C (-2.0 F)
2015-25.0 C (-13.0 F)
2016-12.2 C (10.0 F)
2017-12.2 C (10.0 F)
2020-10.6 C (12.9 F)
2021-7.8 C (18.0 F)
2022-17.2 C (1.0 F)
2023-8.3 C (17.1 F)
2024-16.1 C (3.0 F)
2025-16.7 C (1.9 F)
2026-15.0 C (5.0 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Williamson by year The wettest day of the year at Williamson, 1951 to 2026. The record is 108.0 mm (4.3 in) in 2004, marked on the chart; the median year is 49.8 mm (2.0 in). 2550751001251960198020002020Record: 108.0 mm (4.3 in) in 2004
The wettest day of the year at Williamson, 1951 to 2026. The record is 108.0 mm (4.3 in) in 2004, marked on the chart; the median year is 49.8 mm (2.0 in).
Wettest day (Rx1day) at Williamson by year
YearWettest day (Rx1day)
195145.7 mm (1.8 in)
195244.2 mm (1.7 in)
195343.7 mm (1.7 in)
195447.0 mm (1.9 in)
195549.5 mm (1.9 in)
195660.2 mm (2.4 in)
195738.6 mm (1.5 in)
195843.2 mm (1.7 in)
195942.2 mm (1.7 in)
196044.5 mm (1.8 in)
196158.7 mm (2.3 in)
196264.5 mm (2.5 in)
196385.9 mm (3.4 in)
196438.1 mm (1.5 in)
196539.6 mm (1.6 in)
196679.2 mm (3.1 in)
196752.8 mm (2.1 in)
196842.2 mm (1.7 in)
196949.8 mm (2.0 in)
197046.0 mm (1.8 in)
197159.4 mm (2.3 in)
197249.5 mm (1.9 in)
197349.5 mm (1.9 in)
197459.2 mm (2.3 in)
197543.2 mm (1.7 in)
197649.5 mm (1.9 in)
197751.3 mm (2.0 in)
197875.9 mm (3.0 in)
197939.4 mm (1.6 in)
198055.6 mm (2.2 in)
198150.8 mm (2.0 in)
198249.8 mm (2.0 in)
198337.6 mm (1.5 in)
198468.6 mm (2.7 in)
198543.2 mm (1.7 in)
198639.4 mm (1.6 in)
198745.7 mm (1.8 in)
198836.8 mm (1.4 in)
198996.5 mm (3.8 in)
199048.3 mm (1.9 in)
1991100.3 mm (3.9 in)
199248.3 mm (1.9 in)
199350.8 mm (2.0 in)
199448.5 mm (1.9 in)
199548.8 mm (1.9 in)
199669.3 mm (2.7 in)
199777.5 mm (3.1 in)
199863.5 mm (2.5 in)
200126.7 mm (1.1 in)
200268.6 mm (2.7 in)
200346.0 mm (1.8 in)
2004108.0 mm (4.3 in)
200595.3 mm (3.8 in)
200655.9 mm (2.2 in)
200778.0 mm (3.1 in)
200847.2 mm (1.9 in)
200963.5 mm (2.5 in)
201053.1 mm (2.1 in)
201158.4 mm (2.3 in)
201256.4 mm (2.2 in)
201345.7 mm (1.8 in)
201453.8 mm (2.1 in)
201550.8 mm (2.0 in)
201652.1 mm (2.1 in)
201749.5 mm (1.9 in)
202025.9 mm (1.0 in)
202190.4 mm (3.6 in)
202273.9 mm (2.9 in)
202382.6 mm (3.3 in)
202437.6 mm (1.5 in)
202573.9 mm (2.9 in)
202648.5 mm (1.9 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Williamson by year The wettest five days of the year at Williamson, 1951 to 2026. The record is 180.3 mm (7.1 in) in 1989, marked on the chart; the median year is 90.4 mm (3.6 in). 0501001502001960198020002020Record: 180.3 mm (7.1 in) in 1989
The wettest five days of the year at Williamson, 1951 to 2026. The record is 180.3 mm (7.1 in) in 1989, marked on the chart; the median year is 90.4 mm (3.6 in).
Wettest five days (Rx5day) at Williamson by year
YearWettest five days (Rx5day)
195152.8 mm (2.1 in)
195284.8 mm (3.3 in)
195357.9 mm (2.3 in)
195468.5 mm (2.7 in)
1955109.2 mm (4.3 in)
195686.9 mm (3.4 in)
195791.4 mm (3.6 in)
1958114.2 mm (4.5 in)
195984.2 mm (3.3 in)
196073.4 mm (2.9 in)
196179.8 mm (3.1 in)
1962110.7 mm (4.4 in)
196387.4 mm (3.4 in)
196452.1 mm (2.1 in)
196568.3 mm (2.7 in)
1966113.8 mm (4.5 in)
196776.7 mm (3.0 in)
196871.4 mm (2.8 in)
196989.1 mm (3.5 in)
197093.2 mm (3.7 in)
1971100.8 mm (4.0 in)
1972116.6 mm (4.6 in)
1973103.6 mm (4.1 in)
1974112.4 mm (4.4 in)
197584.7 mm (3.3 in)
1976123.4 mm (4.9 in)
1977108.2 mm (4.3 in)
1978125.7 mm (4.9 in)
197986.1 mm (3.4 in)
198092.9 mm (3.7 in)
1981106.5 mm (4.2 in)
198289.5 mm (3.5 in)
198383.1 mm (3.3 in)
1984143.8 mm (5.7 in)
198568.6 mm (2.7 in)
198678.0 mm (3.1 in)
198781.8 mm (3.2 in)
198890.4 mm (3.6 in)
1989180.3 mm (7.1 in)
199071.1 mm (2.8 in)
1991146.0 mm (5.7 in)
199273.7 mm (2.9 in)
199355.8 mm (2.2 in)
1994103.6 mm (4.1 in)
199572.8 mm (2.9 in)
1996104.7 mm (4.1 in)
199787.4 mm (3.4 in)
1998109.2 mm (4.3 in)
200137.6 mm (1.5 in)
2002113.6 mm (4.5 in)
2003104.1 mm (4.1 in)
2004169.0 mm (6.7 in)
2005175.3 mm (6.9 in)
2006108.9 mm (4.3 in)
200782.6 mm (3.3 in)
200885.0 mm (3.3 in)
200990.4 mm (3.6 in)
201086.4 mm (3.4 in)
2011104.8 mm (4.1 in)
201289.9 mm (3.5 in)
2013126.2 mm (5.0 in)
201493.2 mm (3.7 in)
201579.7 mm (3.1 in)
201693.2 mm (3.7 in)
201743.2 mm (1.7 in)
202047.3 mm (1.9 in)
2021162.1 mm (6.4 in)
2022135.9 mm (5.4 in)
2023103.2 mm (4.1 in)
2024103.7 mm (4.1 in)
2025107.5 mm (4.2 in)
202671.6 mm (2.8 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Williamson by year The longest dry spell of the year at Williamson, 1951 to 2026. The record is 28 days in 1963, marked on the chart; the median year is 14 days. 01020301960198020002020Record: 28 days in 1963
The longest dry spell of the year at Williamson, 1951 to 2026. The record is 28 days in 1963, marked on the chart; the median year is 14 days.
Longest dry spell (CDD) at Williamson by year
YearLongest dry spell (CDD)
195114 days
195223 days
195321 days
195411 days
195521 days
195614 days
195720 days
195822 days
195919 days
196018 days
196113 days
196217 days
196328 days
196428 days
196516 days
196620 days
196714 days
196817 days
196916 days
197020 days
197112 days
197213 days
197319 days
197414 days
19759 days
197612 days
197715 days
197812 days
197911 days
198019 days
198116 days
198217 days
198322 days
198413 days
198516 days
198610 days
198714 days
198820 days
198924 days
199014 days
199126 days
199221 days
199317 days
199413 days
199513 days
199616 days
199718 days
19989 days
200116 days
200226 days
200311 days
200410 days
200515 days
200611 days
200712 days
200811 days
200912 days
201019 days
201113 days
201214 days
20139 days
201412 days
20156 days
20167 days
20175 days
20206 days
202110 days
202212 days
202321 days
202413 days
202512 days
202617 days

Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.

Rainfall Return Levels

57 years, 1952 to 2025

A day with at least 53.5 mm (2.1 in) of rain is expected about once in 2 years. A day with at least 129.1 mm (5.1 in) of rain is expected about once in 100 years.

Rainfall return levels at Williamson: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years53.5 mm (2.1 in)
5 years68.3 mm (2.7 in)
10 years79.9 mm (3.1 in)
25 years97.2 mm (3.8 in)
50 years112.2 mm (4.4 in)
100 years129.1 mm (5.1 in)Longer than the 57 years of record

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 57 years of values from 1952 to 2025.

A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.

The largest wettest-day totals in the fit: 108.0 mm (4.3 in) in 2004; 100.3 mm (3.9 in) in 1991; 96.5 mm (3.8 in) in 1989.

Download the Data

  • Data for Williamson standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Williamson threshold days by year: CSV or JSON. Field meanings are on the data page.

Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-13 (13 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2026-10-14).